Miley Cyrus has refused to perform on The Voice because of Christina Aguilera.

The "Wrecking Ball" hitmaker reportedly has an intense dislike of the show's coach - who, like Miley, shot to fame as a young Disney star - and even though the "Fighter" singer is currently on a two-season break from the competition, she won't sing on the show.

"Miley is no friend or supporter of Christina, despite the fact they have a lot in common, including long associations with Disney and using some of same people through the years on their respective business teams. Even if Christina has temporarily stepped aside, The Voice is still Christina's show and Miley doesn't want to lift a finger to help that woman," a source said.

Show bosses are said to be upset as they are desperate for the former Hannah Montana star to sing on the season finale. "Last month Voice bosses made Miley another offer to have her perform on the finale show and Miley said no - and was very clear about her reasons!" the source said.

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The Coldplay frontman will have a special advisory role on the show - which has Adam Levine, Shakira, Usher and Blake Shelton as coaches - and met with the contestants ahead of the Battles: Round Two stage of the contest to advise them on their performances.

"Chris is to work with @adamlevine @blakeshelton @usher & @shakira as a Key Adviser on this season's US #TheVoice [sic]," a post on Coldplay's Twitter account read.

Network NBC, who aired the show, went on to explain Chris' role in more detail, revealing the "Viva La Vida" hitmaker helped the contestants with "vocal technique and stage presence." They said in a statement, "Martin advised each of the Battles: Round Two performers on vocal techniques, stage presence and the importance of tailoring songs to fit their persona and strengths. These artists will continue to try and earn the support of their respective coaches, who will be forced to decide who will move on to the Playoff Rounds. Each coach will have the opportunity to strategically steal one more artist in this round."

The "Forget You" hitmaker has been a judge on the version of the singing contest on the first three series, before returning on the fifth series last year, but has now decided to step back to focus on other TV projects.

"I'm not coming back guys. I'm going to continue my relationship with NBC. I have a television show development deal with them as well and hopefully some other talk show opportunities for later in the year. But yeah, I'm going to miss The Voice too. So I'm not coming back guys," he said, speaking on The Ellen DeGeneres Show.

Shocked by his revelation, Ellen replied, "Oh, you're not coming back at all? I did not know that!"

CeeLo is hoping to take some time to focus on his music and is excited about the release of his next album Girl Power, which is due out between February and March.

The Black Eyed Peas star interrupted a meeting between BBC bosses and the "Spinning Around" hit-maker in a bid to convince the Australian pop singer to accept a role on the panel alongside fellow judges Tom Jones and Kaiser Chiefs frontman Ricky Wilson. "I was considering it and I didn't I know what the answer was. Then I had a meeting in LA and Will.i.am bombed the meeting. I had just one question to Will - how was the experience? He said he loved it, so I thought, 'OK, that's cool,'" Kylie recalled.

NBC revealed the star - who has not performed for 12 years - will sing on the talent show's season finale on June 18. The 67-year-old is going to make her TV comeback with "Woman's World," the first single from her upcoming album of the same name.

Cher took to Twitter to share her excitement with millions of her fans claiming "it should be fun."

The singer will be making her comeback in front of Adam Levine, Blake Shelton, Shakira, and Usher who have taken their seat as judges on the show as mentors to the show's contestants. She last sang on TV at the 2002 VH1 Divas Las Vegas special, although she has appeared alongside Christina Aguilera in the 2010 film Burlesque and starred in documentary Dear Mom, Love Cher about her mother, Georgia Holt.

Christina Aguilera is returning to The Voice. The pop diva will reclaim her judge's chair on the next season of the singing contest, ousting current mentor Shakira.

A mole told The Wrap that former panelist Christina - who left the show in 2012 after three seasons to promote her latest album LOTUS - is expected to return this autumn after signing a deal worth a rumored $17 million.

It is as yet unclear whether Cee Lo Green, who also departed last year, will be returning alongside Christina or whether his popular replacement, Usher, will stay on.

The current line-up of NBC's singing competition, which also features Adam Levine and Blake Shelton, has proved a hit with audiences and ratings are at an all-time high. Producer Matt Burnett confirmed Shakira's departure and explained change was a natural progress when working with successful recording artists: "Everybody can't coach for life because when you have people with current recording in the game, this is not their job. Their job is their fans and making music and being live, and so we knew from the beginning that this would happen, and we've had six coaches. They all have another life and their schedules."

Adam Levine will make his Saturday Night Live hosting debut on January 26.

While the Voice judge and Maroon 5 frontman will host for the first time ever in the episode which will feature musical guest Kendrick Lamar, he has previously appeared in a digital short on the comedy sketch show with Andy Samberg and Fred Armisen.

Adam's appearance will take place once week after Silver Linings Playbook star Jennifer Lawrence makes her SNL debut on January 19 with a performance from The Lumineers.

Adam recently revealed he will miss Christina Aguilera and Cee Lo Green on The Voice as they take a season off to focus on their respective music careers but admitted he is excited about their replacements Usher and Shakira: "Christina and Cee Lo are so close to my heart because we went through the show becoming a success together and Usher and Shakira are coming into it as a big institution. So it's different but it still feels good because they are legitimate artists. I knew Usher before. We've worked in the studio a couple of times together. Shakira is a new friend but I love her dearly already. She's so sweet and adorable and hilarious."

Ricky Martin has no plans to reveal his nasty side on The Voice Australia.

The "Livin' La Vida Loca" singer - who is set to finish his stint performing in Evita on Broadway on January 26 - has signed on to judge the second series of the show but the Grammy winner said he won't be the show's version of Simon Cowell.

The 40-year-old star told the Huffington Post, "I don't believe in tough love. I believe in love, and I believe in being nurturing to new talented men and women."

Ricky is heavily involved in the development of a new dramedy series tackling social issues with a sense of humor for NBC that he will produce, write and star in. The series is expected to hit screens next year.

"It's about growing. It's a moment in my life where I just need to absorb and be surrounded by amazing actors and musicians and grow as an entertainer. I think this is going to be an amazing year for that," he said.

Dolly Parton has turned down American Idol and The X Factor. The legendary singer was approached to join both shows as a judge over the years but admitted the only TV talent search she would ever consider appearing on is The Voice because it is more nurturing to its contestants.

"I've been asked to do American Idol and The X Factor almost every time there's a new season. [On The Voice] you don't have to judge that much and I hesitate to judge people," she said.

Dolly previously revealed she will always be grateful to Whitney Houston for making her song "I Will Always Love You" famous and credits her friends and God with preventing her from going down the same road as the tragic singer, who drowned following an accidental overdose in a hotel bathtub in February: "I thank God every day for that song - and Whitney made it popular worldwide. It's a very simple song, really, as simple as anything I've ever written. I've always had good and close friends, and a spiritual faith. God will take the wrong people and things out, and teach me to have the right people and the right things. Some people don't have that, and that's where it can go wrong."

The Maroon 5 singer will be joined on The Voice by the singer and Usher next season when they replace Cee Lo Green and Christina Aguilera, but he has no plans to subject her to any initiation ceremonies because he knows the pregnant star is more than a match for him.

"[Fellow coach] Blake Shelton and I don't have it in our hearts to do anything terrible and I know Shakira, she could knock me out," he said.

While he is excited about working with Shakira, Adam will miss Christina, despite their bickering on the show: "We never hated each other. It was just silly bickering, like brother and sister. That's in the past, I'll miss her next season."